Wire EDM Machine Operation Chapter 9
Copyright November, 98 Page 9-2 Sodick Inc.
Figure 9-1
After the punch is machined the operator will tell the control to stop (with an M00). This
will allow the operator to apply clamps, magnets etc. These will support the punch during
the cutoff. Then the operator will command the punch to be cut off with a straight cut
across the tab area. It is wise to cut the punch off in a way that leaves a minimum amount
of stock for grinding (.010" stock or so).
If trim passes are required on a punch, it makes programming more difficult. This is
because it is usually desired that the trim passes alternate forward and reverse. This
allows all the passes to be performed without stopping the machine to rethread the wire.
In this method, the NC program would need to be written to include the reverse motion.
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Dies present a slightly different problem. On the first rough pass, the machine must be
stopped just prior to when the slug is to be cut off; otherwise the slug will interfere with
the movement back to the start point. The operator then supports the part and the cut-off
is executed. It must be stopped again after the cut off before the wire returns back to the
start point. This will allow the operator to remove the slug.
If trim passes are necessary, it is best to make them in a reverse direction (but not
mandatory). If the trim passes are made in the same direction as the rough pass the wire
will have the tendency to follow the motions of the rough pass. If any washout occurred
on corners during the rough pass, the trim pass will try to follow the washout. But if
reverse direction trim passes are made, the wire will have the tendency to start fresh as it
enters any washout areas. However, reverse trim passes are a little more difficult to
program (manually) and many manual programmers will simply program trim passes in
the same direction as the rough pass.
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